Propeller.



No. 673,468. Patented May'7, I90l.

G. H. COVE. I

PBOPELLEB.

(Application filed Sept. 20, 1900.)

(No Model.)

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' 1 UNITED STATES PATENT OFFICE. A

GEORGE HENRY COVE, OF NEWVCASTLE, CANADA, ASSIGNOR OF ONE-HALF TO CHARLES PETER PARK, OF SAME PLACE.

PROPELLER."

SPECIFICATION forming part of Letters Patent No. 673,468, dated May 7, 1901.

hereby declare that the following is a full,

clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in propellers designed to be used as a substitute for the ordinary screw now employed as a means for the propulsion of steam vessels; and one object in view is to provide an improved construction which will attain maximum efficiency when in action by reason of the large area of active surface which is brought into play.

A further object is to provide for the re moval expeditiously of either of a series of blades in the event of breakage or injury thereto and, furthermore, to simplify the construction and promote the efficiency of operation.

With these ends in View the invention consists in the novel construction and arrangement of parts, which will be hereinafter fully described and claimed.

In the drawings hereto annexed and forming a part of this specification, Figure 1 is a front elevation of a propeller constructed in accordance with my invention. Fig. 2 is an edge view thereof looking at the right-hand edge of Fig. 1. Fig. 3 is an enlarged detail perspective view of a portion of the propeller, illustrating one of the blades'thereof. Fig. 4 is a cross-section taken in the plane of the dotted line 4 4 on Fig. 1. r

The same numerals of reference denote corresponding parts in each figure of the drawlngs.

The body 10 of the propeller is of spiral form, which is made by the development of a disk which is split at the radial line and has its leading and following ends 11 12 arranged in overlapping relation, as shown by Fig. 2, whereby the disk is made to follow the form of a spiral in order to secure the action of a Application filed September 20, 1900. Serial No. 30,536. (No model.)

screw on the water. This spiral body has a hub 13, which is preferably integral with said body, and in the body is a series of quadrantal slots or openings 14, the same being arranged equidistant from each other, beginning with the leading end and terminating at the following end of the spiral body. 7

The lateral deflection of the ends 11 12 of the spiral body provides a space or throat, which is clearly indicated by Fig. 2 and which pro-, vides for the easy passage of the body through v the water, and each end of said body is beveled or inclined, as indicated at 15. (See Fig. 2.) Each slot 14 has a narrow end adjacent to the hub 13, while its wide end is adjacent to the perimeter of the spiral body, and in each of these slots is secured a blade 16, which is set or arranged at an angle to the plane of the faces of the body and to the axis of the propeller-wheel. Of course a series of these angular blades 16 are provided in the slots of the spiral body, and, as shown by Fig. 2, two of these blades are disposed quite close together in the slots at the leading and following ends of said body 10, the last two men tioned blades being properly spaced apart in order to exert the necessary action on the water. of the propeller-hub makes the blades assume diagonal positions, so that the opposite edges of each blade project from opposite faces of the propeller-body, and thus the effective area of the propeller is augmented by the peculiar disposition of the blades on the spiral body. It will of course be understood that the spiral form of the body will itself be capable of exerting a propulsive action on the vessel to which the propeller is applied; but the action of the propeller as an entirety is augmented by the provision of the diagonal blades, which increase the effectiveness of the device by increasing the area of active surface thereof.

It is my purpose to make the propeller-body- The inclination of the blades to the axis are liable to be injured or broken it is my preference to secure each blade removably in the spiral body. This embodiment of the invention is shown by the drawings by the provision of the lugs 17, arranged in pairs on the hub 13 and in positions to receive the inner smaller ends of the diagonal blades, each blade being fitted between one pair of lugs and secured firmly thereto by a bolt 18, although equivalent means for removably and firmly securing the inner end of the blade to the hub may be adopted. To secure the wide outer end of each diagonal blade to the spiral body in a removable and firm manner, I have devised the double shoe 20, which is arranged to embrace the outer end edge of the blade, and a web 21 at the perimeter of the slotted portion of said spiral body. This double shoe consists of two clips 22 23, arranged at an angle one to the other, so as to'cross in a manner corresponding to the diagonal position of the blade with respect to the rim. One portion 22 of this shoe fits or laps the outer end edge of the blade, while the'other portion 23 overlaps the inner edge of the web 21 on the spiral body, as shown more clearly by Figs.

'3 and 4. The body portion 23 of the shoe may be riveted or otherwise attached to the bodyweb 21; but I prefer to attach the blade portion 22 of the shoe to the blade by means of the bolts 24:. It is evident that the bolts 18 24 may be removed for the purpose of displacing the blade from the propeller, and a new blade may easily be fitted in the pair of lugs and in the blade portion of the shoe, after which the bolts should be replaced, so as to firmly secure the blade to the propeller.

Changes within the scope of the appended claims may be made in the form and proportion of some of the parts, While their essential features are retained and the spirit of the invention is embodied. Hence I do not desire to be limited to the precise form of all the parts as shown, reserving the right to vary therefrom.

Having thus described my invention, what I claimas new is- 1. A screw-propeller consisting of a spiral slotted body, and a series of diagonal blades secured in the slotted portion of the body, substantially as described.

2. A screw-propeller comprising a spiral slotted body, a series of blades arranged in the slotted portions of the body, and means for removably securing said blades in place, substantially as described.

3. In a screw-propeller, a spiral body consisting of the development of an annular split disk having its ends disposed in overlapping relation and separated laterally so as to form an intermediate throat or opening, said body provided at intervals with a series of slots, combined with blades secured in the slotted portions of the body, substantially as described. p

4. A screw-propeller comprising a spiral body formed by the development of a disk having its end portions overlapped and spaced laterally and provided with a series of slots, and a series of blades mounted in the slotted portions of the spiral body and disposed at an angle to the axis of said body so as to lie diagonal to the plane of the faces thereof, each blade having its opposite edges exposed beyond the opposite faces of the slotted portion of the body in which it is mounted, substantially as described.

5. A screw-propeller comprising a slotted body, a series of blades arranged in said slotted body and each having its inner end secured removably thereto, and a shoe mounted on the body at the rim portion thereof and having the outer end of one blade secured removably thereto, substantially as described. In witness whereof I have hereunto set my hand in the presence of two witnesses.

GEORGE HENRY COVE. Witnesses:

E. P. WILLISTON, J. W. COPELAND. 

